im a new member here and was brought up with these, in your valve line up did you forget the audio output valve? from memory it was mounted upside down and used to fail frequently, i think it was the pcl82, am i right. great site by the way
I wouldn't say forgot just neglected to list it in the line-up on the TV collection page Luckily the one in my set works fine, in fact its running on all the valves it arrived with.
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Interesting - I worked for a Bush dealer and the identical chassis layout was used in the TV105,115 & 125 series and possible some of the TV13x series and I don't recall ever changing a PCL82 in any of them!
When all else fails, read the instructions
PCL82 I think must be one of the most reliable valves around--I dont think I ever replaced a faulty one....
Much better than its so-called replacement, the PCL86--They are junk in comparison!....
Yesterday I replaced the original PCL82 sound output valve in my Marconi VT161. 1958 to 2014. How about that for a long lived valve?
Till Eulenspiegel.
Till--
Was that PCL82 actually worn out/faulty, or were you just freshening the set up a bit?
Still, after all those years, I guess even one of those valves deserves retirement!
The valve was just worn out. The sound became almost inaudible although the main reason why the set was returned to the bench was to replace the local-distant control. The VT161 sits on top of my standards converter and the main duty for the set is to monitor the picture.
The PCL82 first appeared in 1954 co-incident with the introduction of 21" 90 degree CRTs.
According to the Radiomuseum the TV valve PCL82 appeared a year before the 6.3volt heater ECL82.
The valve was criticised for it's unusually long triode section, it's same as the pentode.
www.radiomuseum.org/tubes/tube_ecl82.html
Described as a "common type Europe" I reckon the developer was Philips. The replacement valve in audio applications was the (E)PCL86. The new valve was not popular with TV set designers.
Till Eulenspiegel.
An interesting replacement for the PCL82 is the pin compatible Mazda 30PL13. The new valve was developed for TV receivers using the 110 degree CRT. Rediffusion employed the 30PL13 in their Mark 7 TV. An economy was effected by employing the same type of timebase PCB as the Mark 6 which used a 90 degree CRT and the PCL82 in the frame timebase.
Till Eulenspiegel.
